138189213 has 16 divisors (see below), whose sum is σ = 206203200. Its totient is φ = 91460880.

The previous prime is 138189211. The next prime is 138189283. The reversal of 138189213 is 312981831.

138189213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138189213 - 2¹ = 138189211 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138189211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14658 + ... + 22163.

It is an arithmetic number, because the mean of its divisors is an integer number (12887700).

Almost surely, 2^138189213 is an apocalyptic number.

It is an amenable number.

138189213 is a deficient number, since it is larger than the sum of its proper divisors (68013987).

138189213 is a wasteful number, since it uses less digits than its factorization.

138189213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36969 (or 36963 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 138189213 is about 11755.3908059239. The cubic root of 138189213 is about 517.0009976698. Note that the first 3 decimals are identical.

The spelling of 138189213 in words is "one hundred thirty-eight million, one hundred eighty-nine thousand, two hundred thirteen".